Update build systems

- Add Makefile with targets for common development commands.
- Use/enforce isort. Repair sort order in various code files.
- Update .travis.yml to use latest linux dist
- Just use requirements.txt for development requirements. setup.py captures
  installation requirements.

Author: jpgrayson

.travis.yml

@@ -1,35 +1,40 @@
-dist: xenial
 language: python
+os: linux
+dist: bionic
 cache: pip
 
-matrix:
+python:
+  - '3.8'
+  - '3.7'
+  - '3.6'
+  - '2.7'
+  - 'pypy3'
+  - 'nightly'
+
+env:
+  - MAKE_TARGET=test
+
+jobs:
   include:
-    - python: '2.7'
-      env:
-        - COVERAGE=--cov
-        - FLAKE8=--flake8
-    - python: 'pypy2.7-6.0'
-    - python: '3.4'
-    - python: '3.5'
-    - python: '3.6'
-    - python: '3.7'
-      env:
-        - COVERAGE=--cov
-        - FLAKE8=--flake8
-    - python: 'pypy3.5-6.0'
-    - python: '3.8-dev'
-    - python: 'nightly'
+    - python: '3.8'
+      env: MAKE_TARGET=lint
+    - python: '3.8'
+      env: MAKE_TARGET=coverage
   allow_failures:
-    - python: '3.8-dev'
     - python: 'nightly'
 
 install:
-  - pip install -r requirements-dev.txt
-  - if [ -n "$COVERAGE" ]; then pip install coveralls; fi
-  - pip install -e .
+  - |
+    if [ "$MAKE_TARGET" = "coverage" ]; then
+      pip install coveralls
+    fi
+  - pip install --upgrade -r requirements.txt -e .
 
 script:
-  - py.test $FLAKE8 $COVERAGE
+  - make "$MAKE_TARGET"
 
 after_success:
-  - if [ -n "$COVERAGE" ]; then coveralls; fi
+  - |
+    if [ "$MAKE_TARGET" = "coverage" ]; then
+      coveralls
+    fi

Makefile

@@ -0,0 +1,39 @@
+PYTHON ?= python
+
+.PHONY: lint
+lint: lint-isort lint-flake8
+
+.PHONY: lint-isort
+lint-isort:
+	isort --check-only --quiet --diff --recursive .
+
+.PHONY: lint-flake8
+lint-flake8:
+	flake8 .
+
+.PHONY: format
+format: format-isort
+
+.PHONY: format-isort
+format-isort:
+	isort --recursive .
+
+.PHONY: test
+test:
+	pytest
+
+.PHONY: coverage
+coverage:
+	pytest --cov
+
+.PHONY: docs
+docs:
+	$(MAKE) -C docs html
+
+.PHONY: build
+build:
+	$(PYTHON) setup.py build
+
+.PHONY: dist
+dist:
+	$(PYTHON) setup.py sdist bdist_wheel

desmod/probe.py

@@ -3,8 +3,8 @@
 import simpy
 import six
 
-from desmod.queue import Queue
 from desmod.pool import Pool
+from desmod.queue import Queue
 
 
 def attach(scope, target, callbacks, **hints):

desmod/progress.py

@@ -1,10 +1,13 @@
-from __future__ import print_function, division
+from __future__ import division, print_function
+
 from collections import OrderedDict
 from contextlib import contextmanager
 from datetime import datetime, timedelta
 import sys
 import timeit
 
+from desmod.timescale import parse_time, scale_time
+
 try:
     import progressbar
 except ImportError:
@@ -14,8 +17,6 @@
 except ImportError:
     colorama = None
 
-from desmod.timescale import parse_time, scale_time
-
 
 @contextmanager
 def standalone_progress_manager(env):

desmod/simulation.py

@@ -1,26 +1,28 @@
 """Simulation model with batteries included."""
 
 from __future__ import division
+
 from contextlib import closing
-from multiprocessing import cpu_count, Process, Queue
+from multiprocessing import Process, Queue, cpu_count
 from pprint import pprint
-from six.moves import filter
 from threading import Thread
-
 import json
 import os
 import random
 import shutil
 import timeit
 
+from six.moves import filter
 import simpy
 import six
 import yaml
 
 from desmod.config import factorial_config
-from desmod.progress import (standalone_progress_manager,
-                             get_multi_progress_manager,
-                             consume_multi_progress)
+from desmod.progress import (
+    consume_multi_progress,
+    get_multi_progress_manager,
+    standalone_progress_manager,
+)
 from desmod.timescale import parse_time, scale_time
 from desmod.tracer import TraceManager
 

desmod/timescale.py

@@ -1,4 +1,5 @@
 from __future__ import division
+
 import re
 
 _unit_map = {'s': 1e0,

desmod/tracer.py

@@ -1,18 +1,19 @@
 from __future__ import print_function
+
 import os
 import re
 import sqlite3
 import sys
 import traceback
 
-import simpy
 from vcd import VCDWriter
+import simpy
 
 from . import probe
-from .util import partial_format
-from .timescale import parse_time, scale_time
-from .queue import Queue
 from .pool import Pool
+from .queue import Queue
+from .timescale import parse_time, scale_time
+from .util import partial_format
 
 
 class Tracer(object):

docs/examples/gas_station/gas_station.py

@@ -18,12 +18,13 @@
 
 from itertools import count, cycle
 
+from simpy import Resource
+
 from desmod.component import Component
 from desmod.dot import generate_dot
 from desmod.pool import Pool
 from desmod.queue import Queue
 from desmod.simulation import simulate
-from simpy import Resource
 
 
 class Top(Component):

docs/examples/grocery/grocery.py

@@ -12,20 +12,21 @@
 
 """
 from __future__ import division
+
 from argparse import ArgumentParser
 from datetime import timedelta
 from functools import partial
 from itertools import count
 
-from desmod.config import apply_user_overrides, parse_user_factors
+from simpy import Container, Resource
+from vcd.gtkw import GTKWSave
+
 from desmod.component import Component
+from desmod.config import apply_user_overrides, parse_user_factors
 from desmod.dot import generate_dot
 from desmod.queue import Queue
 from desmod.simulation import simulate, simulate_factors
 
-from simpy import Container, Resource
-from vcd.gtkw import GTKWSave
-
 
 class Top(Component):
     """The top-level component of the model."""